ing

As an adjective free

is (label) unconstrained.

As an adverb free

is without needing to pay.

As a verb free

is to make free; set at liberty; release; rid of that which confines, limits, embarrasses, or oppresses.

As a noun free

is (australian rules football|gaelic football) abbreviation of free kick.

As a proper noun ing is

shortened from inga, rare by itself but a popular first part of twentieth century hyphenated names like ing-britt and ing-marie.