A seven letter word that means a high shrill sound would be "whistle".
Gastric.
villain
Precede.
rebirth
A seven letter word that means most favorable is favorite.
feature, picture
A seven letter word that means a high shrill sound would be "whistle".
shakily
Snow White and the Seven Dwarfs.
forfeit
replace
Confide
tattler
consume
kissing
unclean...