• qelcome mat,
• aelcome mat,
• selcome mat,
• eelcome mat,
• 3elcome mat,
• 2elcome mat,
• wwlcome mat,
• wslcome mat,
• wdlcome mat,
• wrlcome mat,
• w4lcome mat,
• w3lcome mat,
• wekcome mat,
• wepcome mat,
• weocome mat,
• welxome mat,
• welvome mat,
• welfome mat,
• weldome mat,
• welcime mat

The adjective form of the phrase "welcome mat" is "welcoming".

The plural form of "welcome mat" is "welcome mats"

The singular form of the word "welcome mat" is "welcome mat". The term remains the same in both the singular and plural forms.