Synonyms for Wood Lily (same or very similar meaning)
WordNet sense 1 (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):
trillium, wake-robinWordNet sense 2 (lily of eastern North America having orange to orange-red purple-spotted flowers):
Lilium philadelphicumFrom the ODE community, based on WordNetadd/edit