This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Agent noun of block; something that blocks something specific.

n. One who blocks: used specifically in hat-making, shoemaking, book-binding, etc.

n. A blocking-tool or -machine.

n. a football player whose responsibility is to block players attempting to stop an offensive play

n. a class of drugs that inhibit (block) some biological process

"Scent blocker is not needed when squirrel hunting; what you do need is a way to slip through the woods as quietly as possible, the best advice I can give you is walk slowly and watch your step."

football player    footballer   

sun blocker    alpha-blocker    beta-blocker   

Fokker    clocker    cocker    crocker    docker    gawker    hocker    laugher    locker    ocker   

agonist    analgesia    bronchodilator    hypersensitivity    andis    thatmay    activator    returner    isoform    signaling