Because of lack of consensus on how to divide the organisms into phyla informal names are used for the major divisions

• Prokaryotic bacteria and blue-green algae and various primitive pathogens

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Monera \Mo*ne"ra\, n. pl. [NL., fr. Gr. mo`nos single.] (Zo["o]l.) The lowest division of rhizopods, including those which resemble the am[oe]bas, but are destitute of a nucleus. 2. (Biol.) One of the five kingdoms of living organisms in the five-kingdom ...

Wiktionary Word definitions in Wiktionary
n. (plural of moneron English)

Wikipedia Word definitions in Wikipedia
Monera ( Greek - μονήρης (monḗrēs), "single", "solitary") was a kingdom that contained unicellular organisms with a prokaryotic cell organization (having no nuclear membrane ), such as bacteria. The taxon Monera was first proposed as a phylum by Ernst Haeckel ...