These are all words for a thing that somebody does.
action a thing that somebody does: Her quick action saved the child’s life. move (used especially in journalism) an action that you do or need to do to achieve something: They are waiting for the results of the opinion polls before deciding their next move. act a thing that somebody does: an act of kindness
ACTION OR ACT? These two words have the same meaning but are used in different patterns. An act is usually followed by of and/or used with an adjective. Action is not usually used with of but is often used with his, her, et cetera: a heroic act of bravery; his heroic actions/acts during the war. Action often combines with take but act does not.
gesture a thing that you do or say to show a particular feeling or intention: They sent some flowers as a gesture of sympathy. deed (formal, literary) a thing that somebody does that is usually very good or very bad: heroic/evil deeds feat (approving) an action or piece of work that needs skill, strength or courage: The tunnel is a brilliant feat of engineering.
PATTERNS AND COLLOCATIONS • a(n) act/gesture/feat of something • to perform a(n) action/act/deed/feat • to make a move/gesture • a heroic/brave/daring action/move/act/gesture/deed/ feat • a kind/charitable/generous action/act/gesture/deed • a(n) evil/terrible action/act/deed