The word you can form from the letters I, G, V, R, T, and Y is "grit."
signature
"GATHER"
Migrant
Those letters will spell the word arrangements.
Stringy. Presuming that the "YOU" was an "I".
generators
The longest word you can make out of those letters is "hydromagnetry," which has 13 letters.
Graduate.
'Entering'. E-N-T-E-R-I-N-G.
refought is one
The anagram is "growths."
Those letters will spell yogurt.