Good
Part of speech: adverb
Definition: Well; satisfactorily or thoroughly.
Part of speech: noun
Definition: The forces or behaviors that are the enemy of evil. Usually consists of helping others and general benevolence. A result that is positive in the view of the speaker. The abstract instantiation of something qualified by the adjective; e.g., "The best is the enemy of the good." An item of merchandise.
Part of speech: adjective
Definition: Acting in the interest of good; ethical. Useful for a particular purpose; functional. Of food, edible; not stale or rotten. Of food, having a particularly pleasant taste. Of food, being satisfying; meeting dietary requirements. Of food, healthful; containing vitamins and minerals. Pleasant; enjoyable. Of people, competent or talented. Effective. Favourable. Beneficial; worthwhile. With "and", extremely. Holy. Reasonable in amount. Large in amount or size. Entire.
Example sentence: The good old days are now.
Proficient
Part of speech: adjective
Definition: Good at; skilled; fluent; practiced, especially in relation to a task or skill.
Part of speech: noun
Definition: An expert.
Example sentence: I think the hard thing about all these tools is that it takes a fair amount of effort to become proficient.