chiggerflower vs silkweed

chiggerflower and silkweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
chiggerflower	Yes	No	No	No
silkweed	Yes	No	No	No

As nouns, silkweed is a hypernym of chiggerflower; that is, silkweed is a word with a broader meaning than chiggerflower:

chiggerflower: erect perennial of eastern and southern United States having showy orange flowers
silkweed: any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts

Other hypernyms of chiggerflower include milkweed.

chiggerflower (noun)	silkweed (noun)
erect perennial of eastern and southern United States having showy orange flowers	any of numerous plants of the genus Asclepias having milky juice and pods that split open releasing seeds with downy tufts