spiegeleisen vs spiegel

spiegeleisen and spiegel both are nouns.

Word	Noun	Adjective	Verb	Adverb
spiegeleisen	Yes	No	No	No
spiegel	Yes	No	No	No

As nouns, spiegeleisen and spiegel are synonyms defined as:

spiegeleisen and spiegel: pig iron containing manganese; used as a deoxidizing agent and to raise the manganese content in making steel

Other synonyms of spiegeleisen include spiegel iron.

spiegeleisen (noun)	spiegel (noun)
pig iron containing manganese; used as a deoxidizing agent and to raise the manganese content in making steel	pig iron containing manganese; used as a deoxidizing agent and to raise the manganese content in making steel