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enter

(adverbial particle, dismissive, derogatory) emphasizes disgust, contempt, or otherwise negative feelings of the speaker: whatever

to go in; to come in / 要る: to be necessary, to be required

to enter, go into, get into a place or a thing / to join a group or organization / to be contained (in), to be included (in) / to be a member of a group, set, category

What? What did you say?

whatchamacallit, X

A containment vessel, as in a nuclear reactor: a large container or containment building intended to isolate its contents from the outside.

what

What?, Huh?