Seat
noun, の adjective
A sit seat is probably going to be a seat.
ざせき
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.
車内で、サーモンが座席から身を乗り出してフグにキスをした瞬間、信号が青に変わった。
The moment Salmon leaned across the seat to kiss Fugu in the car, the traffic light turned green.