hogweed vs cow parsnip

hogweed and cow parsnip both are nouns.

Word	Noun	Adjective	Verb	Adverb
hogweed	Yes	No	No	No
cow parsnip	Yes	No	No	No

As nouns, hogweed and cow parsnip are synonyms defined as:

hogweed and cow parsnip: tall coarse plant having thick stems and cluster of white to purple flowers

Other synonyms of hogweed include Heracleum sphondylium.

hogweed (noun)	cow parsnip (noun)
tall coarse plant having thick stems and cluster of white to purple flowers	tall coarse plant having thick stems and cluster of white to purple flowers