Synonmy

Synonyms are tow or more forms with very closely related meanings,which are often ,but not always, intersubtitutable in sentences

Examples:
answer_reply
liberty_freedom


Antonymy

Two forms with opposite meanings

Examples:
happy_sad
slow_quick


Hyponymy

When the meaning of one form is included in the meaning of another

Examples:
carrot_vegetable
cat_animal