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Lifer

//ˈlaɪfə(ɹ)// noun

Noun

1
A prisoner sentenced to life in prison.
2
a prisoner serving a term of life imprisonment wordnet
3
A prisoner sentenced to transportation for life.
"They know what a clever lad he is; he'll be a lifer. They'll make the Artful nothing less than a lifer."
4
A person with a singular career path, especially in the military.
""[…]The Top's not a lifer; he's a career Marine. Lifers are a breed. A lifer is anybody who abuses authority he doesn't deserve to have. There are plenty of civilian lifers.""
5
A species seen for the first time by a naturalist who is keeping a list of all the species they have seen.
"We have concurred that it was clearly Problema byssus, the byssus skipper: a lifer for me."

From life + -er.

Unscramble this word: lifer