pineweed vs pine-weed

pineweed and pine-weed both are nouns.

Word	Noun	Adjective	Verb	Adverb
pineweed	Yes	No	No	No
pine-weed	Yes	No	No	No

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

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

Other synonyms of pineweed include Hypericum gentianoides, nitweed, orange grass.

pineweed (noun)	pine-weed (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