flute vs Boehm flute

flute and Boehm flute both are nouns.

Word	Noun	Adjective	Verb	Adverb
flute	Yes	No	Yes	No
Boehm flute	Yes	No	No	No

As nouns, Boehm flute is a hyponym of flute; that is, Boehm flute is a word with a more specific, narrower meaning than flute:

flute: a high-pitched woodwind instrument; a slender tube closed at one end with finger holes on one end and an opening near the closed end across which the breath is blown
Boehm flute: The Western concert flute (also called transverse flute, C flute or Boehm flute) is a side-blown woodwind instrument made of metal or wood.

Other hyponyms of flute include fife, nose flute, piccolo, C flute, transverse flute, Western concert flute.

flute (noun)	Boehm flute (noun)
a high-pitched woodwind instrument; a slender tube closed at one end with finger holes on one end and an opening near the closed end across which the breath is blown	The Western concert flute (also called transverse flute, C flute or Boehm flute) is a side-blown woodwind instrument made of metal or wood.
a groove or furrow in cloth etc (particularly a shallow concave groove on the shaft of a column)
a tall narrow wineglass

flute (verb)	Boehm flute (verb)
form flutes in