This is the 6979th most frequent Japanese word.
マルイ
"マルイ" means "round" in English.
マルイ is used to describe a characteristic of the pen, referring to 'round' being its shape or design.
マルイペンを使って絵を描いた。
I drew a picture using a round pen.
マルイ is used to describe the physical shape of the ball, indicating 'round'.
このボールはとてもマルイです。
This ball is very round.
マルイ is used to describe the shape of her face, indicating 'round'.