Titty
Part of speech: noun
Definition: a breast a nipple a kitten (Scottish colloquial) a sister or girl
Bosom
Part of speech: noun
Definition: chest, breast; the pectoral muscles and mammae of the human, especially the female human.
Part of speech: adjective
Definition: In a very close relationship.
Example sentence: Every true Christian is a soldier - of Christ - a hero 'par excellence'! Braver than the bravest - scorning the soft seductions of peace and her oft-repeated warnings against hardship, disease, danger, and death, whom he counts among his bosom friends.