Yet our very own Savior, the Lord Jesus Christ, used the self same word, logos, when he was specifically talking about God's written word:
Making the word of God of none effect through your tradition, which ye have delivered: and many such like things do ye. (Mark 7:13)
Another interesting factoid about the word "logos" is:
Note: A Greek philosopher named Heraclitus first used the term Logos around 600 B.C. to designate the divine reason or plan which coordinates a changing universe.
We also know that this very word in John, "denotes the essential Word of God, Jesus Christ, the personal wisdom and power in union with God, his minister in creation and government of the universe, the cause of all the world's life both physical and ethical, which for the procurement of man's salvation put on human nature in the person of Jesus the Messiah, the second person in the Godhead, and shone forth conspicuously from His words and deeds." (http://www.blueletterbible.org/lang/lexicon/lexicon.cfm?Strongs=G3056&t=KJV)
In the Old Testament, the phrase "Word of God" or "Word of the Lord" was used quite a few times. One time was in I Chronicles 17:3, "And it came to pass the same night, that the word of God came to Nathan, saying,". The Hebrew word used is "dabar" and it means:
1) speech, word, speaking, thing
b) saying, utterance
c) word, words
d) business, occupation, acts, matter, case, something, manner (by extension)
In the Authorized Version, this Hebrew word is used 1439 times and is translated as word 807 times; thing 231 times; matter 63 times; acts 51 times; chronicles 38 times; saying 25 times; commandment 20 times and misc 204 times. The WORD can most definitely be a "book" - one that contains the very words of God - though we all know it encompasses much, much more.
More precisely a book may be a small subset of the Word, but it is never the Word. To suggest otherwise is a form of idolatry. Peace be to you.
**Partial list of references to Divine written revelation being written (Scripture) and references to it, substantiating the claim that as they were written, the written word became the standard for obedience and in establishing truth claims. In full, the New Testament is counted to have 263 direct quotes from and 370 allusions to the Old. The following list does not include all of the former, and rarely includes simple allusions to Scripture, but supplies a multiplicity of viewable references (see here for popup viewing on mouse hover) to what was written or quotes thereof: Ex. 17:14; 24:4,7,12; 31:18; 32:15; 34:1,27; 35:29; Lv. 8:36; 10:10,11; 26:46; Num. 4:5,37,45,49; 9:23; 10:13; 15:23; 16:40; 27:23; 33:2; 36:13; Dt. 4:13; 5:22; 9:10; 10:2,4; 17:18,19; 27:3,8; 28:58,61; 29:20,21,27; 30:10; 31:9,11,19,22,26; 33:4; Josh. 1:7,8; 8:31,32,34,35; 10:13; 14:2; 20:2; 21:2; 22:5,9; 23:6; 24:26; Jdg. 3:4; 1Sam. 10:25; 2Sam. 1:8; 1Ki. 2:3; 8:53,56; 12:22; 2Ki. 1:8; 14:6; 17:37; 22:8,10,13,16; 23:2,21; 1Ch. 16:40; 17:3,9; 2Ch. 23:18; 25:4; 31:3; 33:8; 34:13-16,18,19,21,24; 34:30; 35:6,12; Ezra 3:2,4; 6:18; Neh. 6:6; 8:1,3,8,15,18; 9:3,14; 10:34,36; 13:1; Psa. 40:7; Is. 8:20; 30:8; 34:16; 65:6; Jer. 17:1; 25:13; 30:2; 36:2,6,10,18,27,28; 51:60; Dan. 9:11,13; Hab. 2:2;
Mat. 1:22; 2:5,15,17,18; 3:3; 4:4,6,7,10,14,15; 5:17,18,33,38,43; 8:4,17; 9:13; 11:10; 12:3,5,17-21,40,41; 13:14,15,35; 14:3,4,7-9;19:4,5,17-19; 21:4,5,13,16,42; 22:24,29,31,32,37,39,43,44; 23:35;24:15; 26:24,31,54,56; 27:9,10,35; Mark 1:2,44; 7:3,10; 9:12,13; 10:4,5; 11:17; 12:10,19,24,26 13:14; 14:21,47,49; 15:28; Lk. 2:22,23.24; 3:4,5,6; 4:4,6-8,10,12,16,17,18,20,25-27; 5:14; 7:27; 8:10; 10:26,27; 16:29,31; 18:20,31; 19:46; 20:17,18, 28,37,42,43; 22:37; 23:30; 24:25.27,32,44,45,46; Jn. 1:45; 2:17,22; 3:14; 5:39,45-47; 6:31,45; 7:19,22,23,38,42,43,51,52; 8:5,17; 9:26; 10:34,35; 12:14,15,38-41; 15:25; 17:12; 19:24,28,36,37; 20:9,31; 21:24; Acts 1:20; 2:16-21,25-28,34,35; 3:22,23,25; 4:11,25,26; 7:3,7,27,28,32,33,37,40,42,43,49,50,53; 8:28,30,32,33; 10:43;13:15,27,29,33,39; 15:5,15-17,21; 17:2,11; 18:13.24,28; 21:20,24; 22:12; 23:3,5; 24:14; 26:22; 28:23,26,27; Rom 1:2,17; 2:10-21,31; 4:3,7,17,18,23,24; 5:13; 7:1-3,7,12,14,16; 8:4,36; 9:4,9,12,13,15,17,25-29,33; 10:11,15,19; 11:2-4,8,9,26,27; 12:19,20; 13:8-10; 14:11; 15:3,4,9-12,21; 16:16,26,27; 1Cor. 1:19,31; 2:9; 3:19,20; 4:6; 6:16; 7:39; 9:9,10; 10:7,11,26,28; 14:21,34; 15:3,4,32,45,54,55; 2Cor. 1:13; 2:3,4; 3:7,15; 4:13; 6:2;16; 7:12; 8:15; 9:9; 10:17; 13:1; Gal. 3:6,8,10-13; 4:22,27,30; 5:14; Eph. 3:3,4; (cf. 2Pt. 3:16); Eph. 4:8; 5:31; 6:2,3; (cf. Dt. 5:16); Col. 4:16; 1Thes. 5:27; 1Tim. 5:18; 2Tim. 3:14,16,17; Heb. 1:5,7-13; 2:5-8,12,13; 3:7-11,15; 4:3,4,7; 5:5,6; 6:14; 7:17,21,28; 8:5,8-13; 9:20; 10:5-916,17,28,30,37; 11:18; 12:5,6,12,26,29; 13:5,6,22; James 2:8,23; 4:5; 1Pet. 1:16,24,25; 2:6,7,22; 3:10-12; 5:5,12; 2Pet. 1:20,21; 2:22; 3:1,15,16; 1Jn. 1:4; 2:1,7,8,12,13,21; 5:13; Rev. 1:3,11,19; 2:1,8,12,18; 3:1,7,12,14; 14:13; 19:9; 21:5; 22:6,7;10,18,19 (Note: while the Bible reveals that there is revelation which is not written down, (2Cor. 12:4; Rv. 10:4) yet interestingly, a study of the the phrase “the word of God” or “the word of the Lord” shows that it revelation that is called that normally was subsequently written down. Nor was the oral truth referred to in 2Thes. 2:15 that of amorphous eons-old traditions which results in different interpretations such as the Roman Catholics and EOs example, but what Paul referred to was known instruction by a manifestly Divinely inspired apostle, who manner was to reason out of the Scriptures, (Acts 17:2) and whose words were examined for veracity by Scripture. (Acts 17:11) And there is no proof that this truth also was not subsequently written down. Note also that establishing truth claims is shown to be done both by way of doctrinal conformity to what had been written, and secondarily by the manner of effectual and often manifest supernatural attestation by the power of God which Scripture reveals the Truth of God being given (and most overtly to the authority of those who added new teachings to Scripture), and obedience to it, to the glory of God, though the many references to this aspect, such as Josh. 3:7 (cf. Is. 63:12); 2Ki. 18:6,7; Mk. 16:20; Jn. 5:36; 14:11,12; Acts 4:33; 15:7-18; Rm. 15:19; Gal. 4:6; 1Thes. 1:3-10, Heb. 2:3,4, are not provided here).