avail

(noun) a means of serving. Synonyms: help, service. Examples: "Of no avail." "There's no help for it."

(verb) use to one's advantage. Example: "He availed himself of the available resources."

(verb) be of use to, be useful to. Example: "It will avail them to dispose of their booty."

(verb) take or use. Synonyms: help. Example: "She helped herself to some of the office supplies."