頂

noun: top; peak, on top of; above (locative)
頂

Wiktionary lists many senses (top of head, peak, to prop up/replace, classifier for hats, Southern Min locative 'above/before', Cantonese slang); the noun/locative sense most relevant to everyday Teochew was chosen, following the precedent set for 內, but the primary sense and part of speech remain approximate.