shovel vs steam shovel

shovel and steam shovel both are nouns.

Word	Noun	Adjective	Verb	Adverb
shovel	Yes	No	Yes	No
steam shovel	Yes	No	No	No

As nouns, steam shovel is a hyponym of shovel; that is, steam shovel is a word with a more specific, narrower meaning than shovel:

Other hyponyms of shovel include backhoe, dredge.

shovel (noun)	steam shovel (noun)
a hand tool for lifting loose material; consists of a curved container or scoop and a handle	a power shovel that is driven by steam
a fire iron consisting of a small shovel used to scoop coals or ashes in a fireplace
a machine for excavating
the quantity a shovel can hold

shovel (verb)	steam shovel (verb)
dig with or as if with a shovel