different between backcard vs backyard

English

back +? card

backcard (plural backcards)

The piece of card used as backing for the clear plastic bubble that contains a packaged toy.

back +? yard

backyard (plural backyards)

A yard to the rear of a house or similar residence.
(colloquial) A person's neighborhood, or an area nearby to a person's usual residence or place of work and where the person is likely to go.
(colloquial) An area nearby to a country or other jurisdiction's legal boundaries, particularly an area in which the country feels it has an interest.

Note that backyard is sometimes written as a single word, but front yard is always written as two words.

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