Occasional
Part of speech: adjective
Definition: limited to certain occasions, oft. used in the sense of "not very often"
Example sentence: To me luxury is to be at home with my daughter, and the occasional massage doesn't hurt.
Casual
Part of speech: noun
Definition: A worker who is only working for a company occasionally, not as its permanent employee.
Part of speech: adjective
Definition: Happening by chance.Coming without regularity; occasional or incidental.Employed irregularlyCareless.Happening or coming to pass without design.Informal, relaxed.Designed for informal use.
Example sentence: I love the culture of grilling. It creates an atmosphere that is festive but casual.