I may have misunderstood something. I thought you were saying that sin is never a verb. Are you saying that sin can be a verb?
Sin can be articular or anarthrous, singular or plural noun in any case, and sin can be a verb in any tense, mood, or voice. And sin can be hamartia/hamartiai or hamartema. The latter is the resulting acts of the verb. The former is what everyone presumes is the verb or the resulting acts OF the verb, whether regarding initial salvation or the ongoing Christian life.
Sin is hamartia, a noun. It is from a- and -meros, with meros being "share/part" and a- being a negation of "no/not". Sin is the missing share or part. It's a noun, but it's a noun like a hole or pit or void is a noun. It's a "something-lessness". And in it's singular articular noun form, it is the missing share or part in us that is the void or our condition and state of being requiring inner resurrection.
And what do you call the opposite of sin?
Righteousness. The missing share/part that is the void is our lack of God communing His righteousness to us because of the spiritual death during our spiration into physical existence at conception.
Righteousness is God's standard for inner character for outer conduct. Without God communing His standard, we must rely on our own. So our condition and state of being is what is brought forth into action as the source of all our doing, whether benevolent or malevolent. Even the best works are sin, because they are our own standard elevated to accomplish what we self-determine as the standard for inward character and outward conduct.