So then, by that reasoning, (because a specific word or phrase is not found written down in Scripture it's not Scriptural), the Bible must not be scriptural and the Holy Trinity must not "scriptural".
Then that must mean that these things are not Scriptural either.
trinity
catholic
pope
eucharist
sacraments
annulment
assumption
immaculate conception
mass
purgatory
magisterium
infallible
confirmation
crucifix
rosary
mortal sin
venial sin
perpetual virginity
apostolic succession
indulgences
hyperdulia
catechism
real presence
transubstantiation
liturgy
free will
holy water
monstrance
sacred tradition
apostolic succession
Benefactress
Mediatrix
Queen of Heaven
Mother of God
beatific vision
Most of those can be inferred from scripture anyway