Seat
noun, の adjective
A sit seat is probably going to be a seat.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
この座席のクッション、めっちゃいい感じ。
This seat's cushion is really comfy.
座席の予約が必要だったとは、知りませんでした。
I didn't know that I had to make reservations for seats.
電車の座席にトコジラミを見つけてしまった。
I found bed bugs on the train seat.