What is another word for species?

There isn't a single perfect synonym for "species," as the word has specific scientific meaning. However, depending on the context, you could use:

General:

* Kind

* Type

* Variety

* Form

* Sort

More scientific:

* Taxon

* Lineage

* Phylum

* Genus (more specific than species)

More informal:

* Breed (for domesticated animals)

* Strain (for microorganisms)

* Variety (for plants)

The best choice will depend on the specific situation and what you want to emphasize.