oxygon

is likely misspelled.

has no English definition.

As a noun oxygon

is a triangle with three acute angles.

As nouns the difference between terms and oxygon

is that terms is while oxygon is (geometry) a triangle with three acute angles.

As nouns the difference between oxygen and oxygon

is that oxygen is a chemical element (symbol O) with an atomic number of 8 and relative atomic mass of 15.9994 while oxygon is a triangle with three acute angles.

As nouns the difference between three and oxygon

is that three is the digit/figure 3 while oxygon is (geometry) a triangle with three acute angles.

As a numeral three

is (cardinal) a numerical value after two and before four represented in arabic digits as ; this many dots (•••).

In geometry terms the difference between triangle and oxygon

is that triangle is a polygon with three sides and three angles while oxygon is a triangle with three acute angles.

As a proper noun Triangle

is the area comprising the cities of Raleigh, Durham and Chapel Hill in North Carolina. Used with "the" except when attributive.