e'er
A three letter synonym for a verse is ode.
Ode
e'er
A three-letter word that means "exist" is almost always "are." See if it will work.
rhyme
No
verse
ode
One seven letter word, One two letter word and a five letter word, One three letter word and a four letter word, One three letter word and two two letter words, Two three letter words, Three two letter words, A two letter word and a four letter word, A six letter word, A two letter word and a three letter word, A five letter word, Two two letter words, A four letter word, A three letter word, or A two letter word.
til
I've is a three letter word. I'll is another three letter word.
A three letter word for a summit = Top.