adherence vs royalism

adherence and royalism both are nouns.

Word	Noun	Adjective	Verb	Adverb
adherence	Yes	No	No	No
royalism	Yes	No	No	No

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

adherence: faithful support for a cause or political party or religion
royalism: adherence or attachment to a monarchy or to the principle of monarchal government

Other hyponyms of adherence include ecclesiasticism, cabalism, kabbalism, traditionalism.

adherence (noun)	royalism (noun)
faithful support for a cause or political party or religion	adherence or attachment to a monarchy or to the principle of monarchal government
the property of sticking together (as of glue and wood) or the joining of surfaces of different composition