RICHWEEDS
Scrabble letter values: R1I1C3H4W4E1E1D2S1 = 18
Definition
RICHWEEDS is the plural of RICHWEED.
noun RICHWEED: erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers.
Synonyms of RICHWEED: horse_balm, horseweed, stoneroot, stone-root, stone_root, Collinsonia_canadensis