guideline vs guidance

guideline and guidance both are nouns.

Word	Noun	Adjective	Verb	Adverb
guideline	Yes	No	No	No
guidance	Yes	No	No	No

As nouns, guidance is a hypernym of guideline; that is, guidance is a word with a broader meaning than guideline:

guideline: a detailed plan or explanation to guide you in setting standards or determining a course of action
guidance: something that provides direction or advice as to a decision or course of action

Other hypernyms of guideline include plan, program, programme, counsel, counseling, counselling, direction.

guideline (noun)	guidance (noun)
a rule or principle that provides guidance to appropriate behavior	the act of setting and holding a course
a detailed plan or explanation to guide you in setting standards or determining a course of action	the act of guiding or showing the way
a light line that is used in lettering to help align the letters	something that provides direction or advice as to a decision or course of action