hairy finger grass vs large crabgrass

hairy finger grass and large crabgrass both are nouns.

Word	Noun	Adjective	Verb	Adverb
hairy finger grass	Yes	No	No	No
large crabgrass	Yes	No	No	No

As nouns, hairy finger grass and large crabgrass are synonyms defined as:

hairy finger grass and large crabgrass: a European forage grass grown for hay; a naturalized weed in United States

Other synonyms of hairy finger grass include Digitaria sanguinalis.

hairy finger grass (noun)	large crabgrass (noun)
a European forage grass grown for hay; a naturalized weed in United States	a European forage grass grown for hay; a naturalized weed in United States