spiegel iron vs spiegel

spiegel iron and spiegel both are nouns.

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

As nouns, spiegel iron and spiegel are synonyms defined as:

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

Other synonyms of spiegel iron include spiegeleisen.

spiegel iron (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