A la. As in, a la mode.

Aural relates to things you hear while oral relates to the things you say or generally relating to the mouth.

Digestive tract.

Every time is two words. Every time, every time.

Entomology is the study of insects. Etymology is the study of words.

Ordinance – a rule or decree Ordnance – weaponry or ammunition

A capella.

Fowl is a bird. Foul means loathsome or offensive.

Gaff is a hook. Gaffe is an embarrassing mistake.

Gild means to cover in gold. A guild is a professional organization.