One more guess and I'll leave it at that. BRAS and BRASS.

That's a better one - brass is completely unrelated to bras - I suppose you could make bras out of brass but I suspect the lady would not be too comfortable.

I suspect the 2nd person form of 4 letter verbs is excluded by the example "ate adding G at the beginning makes it gate which is NOT ANYWAY RELATED to ate apart from spelling" (capitalisation added).
nimesh, SaswatPadhi likes this