English words with three or more completely unrelated meanings

[astro]

Bore

http://dictionary.reference.com/browse/bore

to weary by dullness, tedious repetition, unwelcome attentions, etc.: The long speech bored me.

to pierce (a solid substance) with some rotary cutting instrument.

an abrupt rise of tidal water moving rapidly inland from the mouth of an estuary.

past tense of the verb “bear”.