velvet bent grass vs dog bent

velvet bent grass and dog bent both are nouns.

Word	Noun	Adjective	Verb	Adverb
velvet bent grass	Yes	No	No	No
dog bent	Yes	No	No	No

As nouns, velvet bent grass and dog bent are synonyms defined as:

velvet bent grass and dog bent: common grass with slender stems and narrow leaves

Other synonyms of velvet bent grass include Agrostis canina, brown bent, Rhode Island bent, velvet bent.

velvet bent grass (noun)	dog bent (noun)
common grass with slender stems and narrow leaves	common grass with slender stems and narrow leaves