bent vs bent-grass

bent and bent-grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
bent	Yes	Yes	No	No
bent-grass	Yes	No	No	No

As nouns, bent and bent-grass are synonyms defined as:

bent and bent-grass: grass for pastures and lawns especially bowling and putting greens

Other synonyms of bent include bent grass.

bent (noun)	bent-grass (noun)
a special way of doing something	grass for pastures and lawns especially bowling and putting greens
a relatively permanent inclination to react in a particular way
an area of grassland unbounded by fences or hedges
grass for pastures and lawns especially bowling and putting greens

bent (adjective)	bent-grass (adjective)
of metal e.g.
fixed in your purpose
used of the back and knees; stooped