I've been doing some tag clean-up (sorry for all the bumps) and came across a few that, in my opinion, should be synonyms. I don't have the privilege to make these changes, but perhaps someone who does, and thinks they should be synonyms, can. For many of these tags, there are few users who can suggest/vote on them so moderator intervention may be required.
- experimental-design ← experiment, experimental - These tags seem redundant.
- materials ← lab-reagents - I recently create the materials tag as a complement to the methods tag and to cover questions that aren't about reagents. I think having the more derived tag lab-reagents is unnecessary given the large overlap and infrequent use.
- methods ← lab-techniques - For the same reason as the lab-reagents tag.
- lymphatic ← lymph - I don't particularly like either of these tags. Perhaps we can make a new tag called lymphatic-system or lymphology (analgous to the current cardiology and oncology tags) and make both of the existing tags synonyms?
- oncology ← cancer, tumor, tumour - These tags all seem redundant.
- species-identification ← identification - I haven't seen the latter tag used in any question not requesting species identification, nor can I think of a use case outside of species identification.
- biochemistry ← chemistry - These two are often used in conjunction. I also cannot think of a question that would be on-topic here which would require the chemistry tag but not the biochemistry tag.
- literature ← reference-request - Related to this topic. reference-request seems unnecessary since, to me, using the literature tag in an implicit request for a reference. The literature tag wiki can be edited to specify that it can be used for to request references.