order Heterosomata vs order Pleuronectiformes

order Heterosomata and order Pleuronectiformes both are nouns.

Word	Noun	Adjective	Verb	Adverb
order Heterosomata	Yes	No	No	No
order Pleuronectiformes	Yes	No	No	No

As nouns, order Heterosomata and order Pleuronectiformes are synonyms defined as:

order Heterosomata and order Pleuronectiformes: flatfishes: halibut; sole; flounder; plaice; turbot; tonguefishes

Other synonyms of order Heterosomata include Heterosomata.

order Heterosomata (noun)	order Pleuronectiformes (noun)
flatfishes: halibut; sole; flounder; plaice; turbot; tonguefishes	flatfishes: halibut; sole; flounder; plaice; turbot; tonguefishes