orange grass vs nitweed

orange grass and nitweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
orange grass	Yes	No	No	No
nitweed	Yes	No	No	No

As nouns, orange grass and nitweed are synonyms defined as:

orange grass and nitweed: annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers

Other synonyms of orange grass include Hypericum gentianoides, pine-weed, pineweed.

orange grass (noun)	nitweed (noun)
annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers	annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers