the '-ing' form of a verb when used as a noun, as in 'fond of swimming'

action word

(of) the form of a verb used with or without 'to', e.g. 'let him go', 'allow hot to go'

action word

to have a share, be involved (in something)

action word

a word showing the performance or occurrence of an action, the existence of a state or condition etc; as in 'I laugh'

action word

a person watching a television programme

witness

a person who was actually present at an event and should, for this reason, be able to describe it; a person who gives evidence under oath in a law court

person who observes an event