• ayngnathus hildebrandi,
• zyngnathus hildebrandi,
• xyngnathus hildebrandi,
• dyngnathus hildebrandi,
• eyngnathus hildebrandi,
• wyngnathus hildebrandi,
• stngnathus hildebrandi,
• sgngnathus hildebrandi,
• shngnathus hildebrandi,
• sungnathus hildebrandi,
• s7ngnathus hildebrandi,
• s6ngnathus hildebrandi,
• sybgnathus hildebrandi,
• symgnathus hildebrandi,
• syjgnathus hildebrandi,
• syhgnathus hildebrandi,
• synfnathus hildebrandi,
• synvnathus hildebrandi,
• synbnathus hildebrandi,
• synhnathus hildebrandi

The adjective form of the term "Syngnathus hildebrandi" is "Syngnathid" or "Hildebrand's syngnathid".

The plural form of "Syngnathus Hildebrandi" is "Syngnathus Hildebrandi." The term is already in its plural form as it represents a specific species name within the genus Syngnathus.

The singular form of the word "Syngnathus Hildebrandi" is "Syngnathus Hildebrandi". The word is a scientific name for a species of fish, and it remains the same in both singular and plural form.