graze, grays

Graze or graze means to feed on grass or plants, moving from plant to plant --
The cattle will graze all Summer and Fall; we only feed them in the Winter.
The horse will graze in the garden if you forget to shut the gate.

Graze or graze also means to brush against or rub so as to leave a scratch or scrape --
The bullet did no more than graze him, but he was stunned and seemed confused.
We let the table graze against the wall, and now it's scratched.

Grays or grays ( rhymes with graze ) is the he, she, it form of "gray", meaning to turn gray, or to become indistinct --
When your hair grays, you'll look just like your father.
The line between guilt and innocence grays when you learn the details.

Now that you know that, you can say --
"She let the sheep graze in the yard; his face grays just thinking about it."