late
1.是形容詞,晚的,已故的等意思很多.如：He is always late.
2.副詞,He comes late.
lately是副詞,近來(lái),不久前.
如：He comes here lately.他最近會(huì)來(lái)到這里
latest
1.是late的最高級(jí),最晚的,最新的.如：This is the latest news
2.是名詞,最晚的,最新的.如：I want the latest.
later是
1.late的比較級(jí),較晚的,更遲的.如：I get up at 10,he is later than me,at 11!
2.副詞,后來(lái),稍后,一會(huì).如：Try again later 稍后再打
以上不是很詳細(xì),不過(guò)可以幫助你理解.