• poastcard,
• poscard,
• poastcards,
• postacard,
• postcart,
• postcerd,
• postcaed,
• postcardd,
• postcards,
• postcarde,
• potcard,
• postcad,
• postkard,
• postcavs,
• postccava,
• postarn,
• fostard,
• potcards,
• poscards,
• postkards

• postdoc,
• postcava,
• postscript,
• postcode,
• postiche,
• postictal,
• post chaise,
• post card,
• postage.

The adjective form of the word "postcard" is "postcard-sized".

The plural of the "postcard" can be the "postcards".

The singular of the "postcard" can be the "postcard".