Yes, it does in one pronunciation (kos-tyoom), the -tume pronounced like fume. In the other major pronunciation, it is a long OO sound with no Y sound in it (kos-toom) as in flume..
Yes, the word "spoon" has a short U sound, not a long U sound.
No, the word "glue" has a long U sound, like "gloo." It is pronounced as "gloo," with the "oo" making the long U sound.
No, the word "flute" does not have a long u sound. It is pronounced with a long "u" sound followed by a "t" sound.
The word mute has a long U (long OO) sound, more specifically the YOO sound (myoot).
Yes, the word "bug" has a short U sound, not a long U sound.
Yes, it does. The U has the long U (yoo) sound. This is the sound heard in huge, human, and humor.
Yes, the word "mule" has a long U sound.
Yes, "shoe" has a long OO sound, the same as the word shoo.
Yes, it is. It has the long YOO vowel sound (U). This sound is heard in the word "fuel" as opposed to the long OO vowel sound in "fool."
Yes, the word "universe" starts with a long U sound.
the word youth has a long "u" sound.
yes, "but" has a short u sound. "Cute" is an example of a word that has a long u sound.