What's the noun for phylum? Here's the word you're looking for.
phylum
(taxonomy) A rank in the classification of organisms, below kingdom and above class; also called a division, especially in describing plants; a taxon at that rank
(linguistics) A large division of possibly related languages, or a major language family which is not subordinate to another.
“Responsive phylotypes were mostly proteobacteria in the subarctic and California HNLC areas, but no changes were noted in the subantarctic experiments.”