companion noun
ADJ. agreeable, amusing, boon, charming, delightful, good, entertaining, pleasant, wonderful | close, constant, faithful, inseparable | life | female, male | canine, human | dinner, drinking, travelling, walking He was an entertaining travelling companion.
PREP. ~ for/to She lived in the house as a companion to our grandmother.
You can also check other dicts: companion (English, 中文解释 ), wordnet sense, Collins Definition