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Pentagon (Noun)

A government building with five sides that serves as the headquarters of the United States Department of Defense.

Nouns denoting man-made objects.

The Pentagon is one of the most recognizable landmarks in Washington D.C.
Aerial footage captured the sprawling Pentagon complex from a bird's-eye view.
During a crisis, top officials gather in secure meeting rooms deep within the Pentagon.
Located across the Potomac River from the nation's capital, the Pentagon is home to over 23,000 personnel.
Each year, thousands of tourists visit the Pentagon's memorial chapel and the nearby cemetery.

The United States military establishment.

Nouns denoting groupings of people or objects.

The Secretary of Defense works out of the Pentagon, the main headquarters of the US Department of Defense in Arlington, Virginia.
Pentagon officials confirmed that the new defense strategy would prioritize investments in advanced technologies.
A Pentagon spokesperson stated that the recent deployment was in response to emerging security threats in the region.
As a key player in national security, the Pentagon must ensure its cybersecurity measures are robust and up-to-date.
In response to rising global tensions, the Pentagon announced a significant increase in its military spending for the upcoming fiscal year.

A five-sided polygon.

Nouns denoting two and three dimensional shapes.

The architect carefully designed the building's façade to resemble a pentagon, incorporating five equal sides and five equal angles.
A pentagon is a type of polygon that can be found in nature, such as in the cross-section of certain flowers.
In geometry class, the students learned to calculate the perimeter and area of a regular pentagon.
The artist created a beautiful mosaic using a pentagon as the central shape, surrounded by intricate patterns and colors.
A regular pentagon has five sides of equal length and five interior angles that add up to 540 degrees.