The recorder is a woodwind musical instrument of the family known as fipple flutes or internal duct flutes — whistle-like instruments which include the tin whistle and ocarina. The recorder is end-blown and the mouth of the instrument is constricted by a wooden plug, known as a block or fipple.[1] It is distinguished from other members of the family by having holes for seven fingers (the lower one or two often doubled to facilitate the production of semitones) and one for the thumb of the uppermost hand. The bore of the recorder is tapered slightly, being widest at the mouthpiece end of it (Baroque recorders) and narrowest at the top, flared almost like a trumpet at the bottom (Renaissance instruments).
A block flute doesn't look like a clarinet.