• yearlung,
• yearlong,
• yerlong,
• yeerlong,
• tear-long,
• gear-long,
• hear-long,
• uear-long,
• 7ear-long,
• 6ear-long,
• ywar-long,
• ysar-long,
• ydar-long,
• yrar-long,
• y4ar-long,
• y3ar-long,
• yezr-long,
• yesr-long,
• yewr-long,
• yeqr-long

The adjective form of "year-long" is "yearlong".

The plural form of "year-long" is "year-longs".

The singular form of the word "year-long" is "year"