G5446–φυσικός–phusikos

For this reason God gave them up to evil passions, and their women were changing the natural use into one which is unnatural:

φυσικὴν phusikēn “natural”

And in the same way the men gave up the natural use of the woman and were burning in their desire for one another, men doing shame with men, and getting in their bodies the right reward of their evil-doing.

φυσικὴν phusikēn “natural”

But these men, like beasts without reason, whose natural use is to be taken and put to death, crying out against things of which they have no knowledge, will undergo that same destruction which they are designing for others;

φυσικὰ phusika “as creatures of instinct”