also vs neither

also

adv

  • In addition; besides; as well; further; too. 

neither

adv

  • Similarly not. 

pron

  • Not either one of two. 

det

  • Not one of two; not either. 

  • Not either (used with nor). 

How often have the words also and neither occurred in a corpus of books? (source: Google Ngram Viewer )