banquet : 指正式而盛大的宴会或国宴。
- Medieval banquets are held in the castle once a month.
- a state banquet in honour of the visiting President
- Last night he attended a state banquet at Buckingham Palace.
feast : 指筵席酒席，有时可与banquet换用，但前者强调共享欢乐的气氛。
- "What a feast!" she said, surveying all the dishes on the table.
- a wedding feast
dinner : 普通用词，含义广。本义指一日的主餐，但多用于指宴请客人的正式的一餐。
- We were just having (our) dinner.
- We had some friends over for dinner on Saturday.
- a romantic candlelit dinner
- They held a dinner to celebrate his retirement.
- a charity/society dinner
party : 指一般的社交聚会，也引申指宴请或宴会。
- a birthday party
- a farewell party
- a dinner party (= a small, sometimes formal party where a meal is eaten)
- UK a fancy-dress (US costume) party (= a party where people wear clothes that make them look like someone or something else)
- Peter has/gives/throws really wild parties.