• gayastan,
• bayastan,
• nayastan,
• jayastan,
• uayastan,
• yayastan,
• hzyastan,
• hsyastan,
• hwyastan,
• hqyastan,
• hatastan,
• hagastan,
• hyastan,
• hayastann,
• hiyastan,
• haiastan,
• hayasten,
• Hayastane,
• Haiyastan,
• Hiyastane

• Hastinapura,
• hastings,
• Hasting,
• haston,
• hasten,
• hastening,
• hastiness.

The adjective form of the word "Hayastan" is "Hayastani".

The plural form of the word "hayastan" is "hayastanner" in Armenian.

The singular form of the word "hayastan" is "hayastan". However, "Hayastan" is the name used to refer to the country Armenia in Armenian language. So, it does not have a different singular form.