noun
competing product; rival product
Used in business and computing contexts for a product that competes directly with another in the market.
新発売の対抗商品がシェアを奪っている。
The newly released competing product is taking market share.
競合製品 is a more general term for competing products, while 対抗商品 often implies a product specifically developed to counter a particular rival.
Compound of 対抗 (opposition, rivalry) and 商品 (product, merchandise).