well A1

/ˈwɛʊ̯/ (often used as a combining form) in a good or proper or satisfactory manner or to a high standard (`good' is a nonstandard dialectal variant for `well')

walk A1

/waːk/ an advance to first base by a batter who receives four balls, in baseball

helicopter B2

/ˈheliˌkɔptə(ɹ)/ An aircraft that is borne along by one or more sets of long rotating blades which allow it to hover, move in any direction including reverse, or land; and typically having a smaller set of blades on its tail to stabilize the aircraft.

involve B1

/ɪnˈvoːv/ make complex or intricate or complicated

wallow C2

/ˈwɑːloʊ/ an indolent or clumsy rolling about