genotype vs biotype

genotype and biotype both are nouns.

Word	Noun	Adjective	Verb	Adverb
genotype	Yes	No	No	No
biotype	Yes	No	No	No

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

genotype: a group of organisms sharing a specific genetic constitution
biotype: organisms sharing a specified genotype or the genotype (or peculiarities) so shared

genotype (noun)	biotype (noun)
the particular alleles at specified loci present in an organism	organisms sharing a specified genotype or the genotype (or peculiarities) so shared
a group of organisms sharing a specific genetic constitution