Nouns

(n)archa curved shape in the vertical plane that spans an opening
(n)archa curved bony structure supporting or enclosing organs (especially the inner sides of the feet)
(n)arch, archwaya passageway under a curved masonry construction“they built a triumphal arch to memorialize their victory”
(n)arch(architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it

Verbs

(v)arch, curve, arcform an arch or curve“her back arches”, “her hips curve nicely”

Adjectives

(s)arch, condescending, patronizing, patronising(used of behavior or attitude) characteristic of those who treat others with condescension
(s)arch, impish, implike, mischievous, pixilated, prankish, puckish, wickednaughtily or annoyingly playful“teasing and worrying with impish laughter”, “a wicked prank”