drill bit

English Thesaurus

1. a bit used in drilling for oil (noun.artifact)

hypernym	:	bit,
definition	:	the cutting part of a drill; usually pointed and threaded and is replaceable in a brace or bitstock or drill press (noun.artifact)

hyponym	:	core bit,
definition	:	a hollow drilling bit that is the cutting part of a core drill; allows core samples to be taken (noun.artifact)

hyponym	:	blade bit, fishtail bit,
definition	:	a drilling bit with cutting edges usually hardened against wear (noun.artifact)

hyponym	:	rock bit, roller bit,
definition	:	a drill bit that has hardened rotating rollers (noun.artifact)