Geezer and Oldtimer

Geezer noun - A man who is (usually) old and/or eccentric.

Oldtimer and geezer are semantically related In some cases you can replace term "Oldtimer" with "Geezer", this nouns are similar.

Oldtimer noun - An experienced person who has been through many battles; someone who has given long service.

Geezer and oldtimer are semantically related in elderly person topic. Sometimes you can use "Geezer" instead a noun "Oldtimer".