allo vs hetero

allo

adj

  • Allosexual and/or alloromantic; experiencing sexual and/or romantic attraction. 

noun

  • One who is allosexual and/or alloromantic. 

hetero

adj

  • Heterosexual: of, pertaining to, or being a heterosexual person. 

noun

  • A heterosexual person. 

How often have the words allo and hetero occurred in a corpus of books? (source: Google Ngram Viewer )