early wake-robin vs trillium

early wake-robin and trillium both are nouns.

Word	Noun	Adjective	Verb	Adverb
early wake-robin	Yes	No	No	No
trillium	Yes	No	No	No

As nouns, trillium is a hypernym of early wake-robin; that is, trillium is a word with a broader meaning than early wake-robin:

early wake-robin: a low perennial white-flowered trillium found in the southeastern United States
trillium: any liliaceous plant of the genus Trillium having a whorl of three leaves at the top of the stem with a single three-petaled flower

Other hypernyms of early wake-robin include wake-robin, wood lily.

early wake-robin (noun)	trillium (noun)
a low perennial white-flowered trillium found in the southeastern United States	any liliaceous plant of the genus Trillium having a whorl of three leaves at the top of the stem with a single three-petaled flower