rayless chamomile vs pineapple weed

rayless chamomile and pineapple weed both are nouns.

Word	Noun	Adjective	Verb	Adverb
rayless chamomile	Yes	No	No	No
pineapple weed	Yes	No	No	No

As nouns, rayless chamomile and pineapple weed are synonyms defined as:

rayless chamomile and pineapple weed: annual aromatic weed of Pacific coastal areas (United States and northeastern Asia) having bristle-pointed leaves and rayless yellow flowers

Other synonyms of rayless chamomile include Matricaria matricarioides.

rayless chamomile (noun)	pineapple weed (noun)
annual aromatic weed of Pacific coastal areas (United States and northeastern Asia) having bristle-pointed leaves and rayless yellow flowers	annual aromatic weed of Pacific coastal areas (United States and northeastern Asia) having bristle-pointed leaves and rayless yellow flowers