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Blocker (Noun)

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

Nouns denoting people.

The blocker lined up in front of the running back and prepared to take on the defensive tackle.
He played the role of a blocker, clearing a path for the quarterback to complete a pass downfield.
As the blocker, it was his job to keep the defensive end from sacking the quarterback on the blitz.
The blocker's ability to neutralize the opposing team's nose tackle gave the offense a huge advantage.
The fullback was used as a blocker on the run play, plowing through the linebacker to clear a hole for the running back.

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

Nouns denoting man-made objects.

Beta blockers are commonly used to treat hypertension by slowing the heart rate and reducing the force of the heart's contractions.
Nonsteroidal anti-inflammatory drugs (NSAIDs) can be classified as prostaglandin blockers because they inhibit the synthesis of prostaglandins, thereby reducing pain and inflammation.
ACE inhibitors, a type of vasopressin blocker, prevent the narrowing of blood vessels by inhibiting the action of a naturally occurring hormone.
Steroid hormone blockers can interfere with the biological function of the sex hormones by occupying hormone receptor sites on cells.
Calcium channel blockers help to regulate the flow of calcium into the heart muscle and blood vessel cells, reducing the frequency and severity of migraines.