bedrock vs alphabet

bedrock and alphabet both are nouns.

Word	Noun	Adjective	Verb	Adverb
bedrock	Yes	No	No	No
alphabet	Yes	No	No	No

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

Other hyponyms of bedrock include first principles, rudiments.

bedrock (noun)	alphabet (noun)
principles from which other truths can be derived	the elementary stages of any subject (usually plural)
solid unweathered rock lying beneath surface deposits of soil	a character set that includes letters and is used to write a language