joy

(noun) the emotion of great happiness. Synonyms: joyousness, joyfulness.

(noun) something or someone that provides a source of happiness. Synonyms: delight, pleasure. Examples: "A joy to behold." "The pleasure of his company." "The new car is a delight."

(verb) feel happiness or joy. Synonyms: rejoice.

(verb) make glad or happy. Synonyms: gladden.