dog fennel vs mayweed

dog fennel and mayweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
dog fennel	Yes	No	No	No
mayweed	Yes	No	No	No

As nouns, dog fennel and mayweed are synonyms defined as:

dog fennel and mayweed: widespread rank-smelling weed having white-rayed flower heads with yellow discs

Other synonyms of dog fennel include Anthemis cotula, stinking chamomile, stinking mayweed.

dog fennel (noun)	mayweed (noun)
widespread rank-smelling weed having white-rayed flower heads with yellow discs	widespread rank-smelling weed having white-rayed flower heads with yellow discs
weedy plant of southeastern United States having divided leaves and long clusters of greenish flowers