Madcap and Odd fellow

Madcap noun - A person who seeks out very dangerous or foolhardy adventures with no apparent fear.

Odd fellow and madcap are semantically related. in oddity topic. In some cases you can use "Odd fellow" instead a noun "Madcap".

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

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