aster family vs thistle

aster family and thistle both are nouns.

Word	Noun	Adjective	Verb	Adverb
aster family	Yes	No	No	No
thistle	Yes	No	No	No

aster family (noun)	thistle (noun)
plants with heads composed of many florets: aster, daisy, dandelion, goldenrod, marigold, lettuces, ragweed, sunflower, thistle, zinnia	any of numerous plants of the family Compositae and especially of the genera Carduus and Cirsium and Onopordum having prickly-edged leaves