1. biology the science that studies living organisms
  2. analogy drawing a comparison in order to show a similarity
  3. hypallage reversal of the syntactic relation of two words
  4. apology an expression of regret at having caused trouble for someone
  5. typology classification according to general category or kind
  6. topology topographic study of a given place
  7. homology the quality of being similar or corresponding in position or value or structure or function
  8. horology the art of designing and making clocks
  9. hagiology literature narrating the lives (and legends) of the saints
  10. histology the study of the microscopic structure of tissues
  11. ideology an orientation that characterizes the thinking of a group
  12. hyperbole extravagant exaggeration
  13. happily in a joyous manner
  14. hoi polloi the common people generally
  15. horologe a measuring instrument or device for keeping time
  16. blog an online journal where people post about their experiences
  17. hydrology the branch of geology that studies water on the earth and in the atmosphere: its distribution and uses and conservation
  18. haploid (genetics) an organism or cell having only one complete set of chromosomes
  19. happy-go-lucky cheerfully irresponsible
  20. apologia a formal written defense of something you believe in strongly