pine-weed vs orange grass

pine-weed and orange grass both are nouns.

Word	Noun	Adjective	Verb	Adverb
pine-weed	Yes	No	No	No
orange grass	Yes	No	No	No

As nouns, pine-weed and orange grass are synonyms defined as:

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

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

pine-weed (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