Maverick and Odd fish

Maverick noun - A person who does not conform to generally accepted standards or customs.

Odd fish and maverick are semantically related. In some cases you can use "Odd fish" instead a noun "Maverick".

Odd fish noun - Someone regarded as eccentric or crazy and standing out from a group.

Maverick and odd fish are semantically related. Sometimes you can use "Maverick" instead a noun phrase "Odd fish".