Definitions:

1. Introduces an alternative idea or emphasizes the contrast between two things. ADVERB
   • The movie wasn't boring; rather, it was too long.
2. Used to clarify or correct something that was said previously. ADVERB
   • He didn't forget, rather, he chose not to attend.
3. Used to express that something happens to a certain extent or degree, often meaning "quite" or "somewhat". ADVERB
   • The weather today is rather warm for this time of the year.
4. Used to indicate a preference for one thing over another. ADVERB
   • I would rather stay home than go to he party.

Synonyms:

• alternatively
• best
• comparatively
• fairly
• in lieu of
• in place of
• in preference
• instead
• kind of
• kinda
• preferably
• quite
• rather than
• relatively
• sort of