チーズ

In a sentence

• 私はチーズを食べるのが大好きです。

  I love eating cheese.

  Here, チーズ (cheese) is used as a noun to indicate the food product.

• 写真を撮る時、「チーズ」と言ってください。

  When taking a photo, please say 'cheese'.

  In this sentence, チーズ (cheese) is used as an interjection said when being photographed, derived from its pronunciation encouraging a smiling expression.

• このソースはとてもチーズっぽい味がします。

  This sauce has a very cheesy taste.

  Here, チーズっぽい (cheese-like) is an adjective form describing the sauce having qualities resembling cheese.