pineweed vs orange grass

pineweed and orange grass both are nouns.

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

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

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

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

pineweed (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