Thine
Part of speech: determiner
Definition: Singular second person prevocalic possessive determiner (preconsonantal form: thy).
Part of speech: pronoun
Definition: Singular second person possessive pronoun.
Thy
Part of speech: conjunction
Definition: because.
Part of speech: pronoun
Definition: That belongs to thee; the possessive form of thou.your (informal); that belongs to you (singular).