nitweed vs orange grass

nitweed and orange grass both are nouns.

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

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

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

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

nitweed (noun)	orange grass (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