Seller
Vendor
noun
Remember how 手 can mean “doer”? Here, we have a sell doer. Who might that be? It’s someone who does selling – a seller or vendor.
売り手 is usually used when talking about sellers versus buyers.
This word uses the kun'yomi readings for both kanji, but you know them both now, so you should be able to read this too! One hint that this is a kun'yomi reading word is the hiragana in the center. It's like two separate words combined together, and when a word is a single kanji / a single kanji with hiragana attached it is usually kun'yomi. This is like two of those, combined.
売り手は男でした。
The seller was a man.
家の売り手は有名なアイドルでした。
The seller of the house was a famous idol singer.
この取引、売り手にとって有利すぎない？
Isn't this transaction too advantageous for the seller?