Formal:
* Verification: This implies confirming the truth or accuracy of something.
* Authentication: This refers to establishing the genuineness of something.
* Designation: This suggests assigning a name or label to something.
* Recognition: This implies acknowledging or being aware of something.
* Appellation: This is a formal name or title given to a person, place, or thing.
Informal:
* Proof: This shows evidence of something being true.
* Label: This is a name or description assigned to something.
* Tag: This is a small label or piece of paper attached to something.
* Mark: This is a sign or symbol that distinguishes something.
* Pinpointing: This means to find something exactly.
Other possibilities:
* Determination: This implies finding out what something is.
* Classification: This involves grouping things based on shared characteristics.
* Tracing: This means to find the origin or source of something.
* Uncovering: This suggests revealing something that was previously hidden.
The best synonym for "identification" will depend on the specific situation.