This is the 17073rd most frequent Korean word.
생
"생" in Korean can mean "life," "raw," or "birth," depending on context.
In this sentence, '생선' ('raw fish') uses the prefix '생-' to indicate a natural or raw state, connected to the word 'fish'.
나는 생선을 먹는 것을 좋아해요.
I like eating fish.
Here, '생-' indicates the raw state of the '고기' ('meat'), forming '생고기' ('raw meat').
그는 생고기를 요리해요.
He cooks raw meat.
In '생화' ('fresh flowers'), '생-' conveys the meaning of 'being live or fresh' and is combined with '화' ('flower').