• synapsis,
• snapsid,
• synapses,
• synapse,
• aynapsid,
• zynapsid,
• xynapsid,
• dynapsid,
• eynapsid,
• wynapsid,
• stnapsid,
• sgnapsid,
• shnapsid,
• sunapsid,
• s7napsid,
• s6napsid,
• synapsod,
• synapsids,
• syanpsid,
• sinapsid

• synapse,
• synopsis,
• synapsis,
• synapsida.

The adjective form of the word "synapsid" is "synapsid".

The plural form of "synapsid" is "synapsids".

The singular form of the word "synapsid" is "synapsid". It is a noun that refers to any member of a group of reptiles that includes mammals and their extinct relatives. The plural form of the word is also "synapsids".