younker vs spring chicken

younker and spring chicken both are nouns.

Word	Noun	Adjective	Verb	Adverb
younker	Yes	No	No	No
spring chicken	Yes	No	No	No

As nouns, younker and spring chicken are synonyms defined as:

younker and spring chicken: a young person (especially a young man or boy)

Other synonyms of younker include young person, youth.

younker (noun)	spring chicken (noun)
a young person (especially a young man or boy)	a young chicken having tender meat
	a young person (especially a young man or boy)