One word for the whole expression

1.   A person’s own handwriting.                                 Autograph

2.   A cure for all ailments.                                        Panacea

3.   A poem without the name of the poet.                Anonymous

4.   A woman whose husband is dead.                          Widow

5.   A person who believes in one God.                        Monotheist

6.   A person who believes in many gods.                   Polytheist

7.   A persons who does not believe in God.                 Atheist

8.   A person who is always hopeful.                           Optimist

9.   A person who is never hopeful.                            Pessimist

10. Something that cannot be done.                          Impossible

11. Two words having the same meaning.                   Synonyms

12. Two words having opposite meaning.                     Antonyms

13. Fit to be chosen or selected.                                    Eligible

14. The life history of a person.                               Autobiography

15. Something that cannot be seen.                              Invisible

16. A place where experiments are carried.                   Laboratory

17. A life history written by oneself.                             Autobiography

18. A person who lives on vegetables.                         Vegetarian

19. One whose father or mother or both are dead.           Orphan

20. A person who checks accounts.                              Auditor

21. A post for which no salary is paid.             `            Honorary

22. One who goes on foot.                                          Pedestrian

23. That cannot be cured.                                            Incurable

24. A speech delivered without preparation.                   Extempore

25. That cannot be read.                                               Illegible

26. That cannot be avoided.                                         Inevitable

27.A person who cannot read or write.                              Illiterate