consider vs observe

consider

verb
  • To look at attentively. 

  • To believe or opine (that). 

  • To think about seriously. 

  • To have regard to; to take into view or account; to pay due attention to; to respect. 

  • To assign some quality to. 

  • To think about something seriously or carefully: to deliberate. 

  • To think of doing. 

  • To take up as an example. 

  • To debate (or dispose of) a motion. 

observe

verb
  • To notice or view, especially carefully or with attention to detail. 

  • To take note of and celebrate (a holiday or similar occurrence); to follow (a type of time or calendar reckoning). 

  • To comment on something; to make an observation. 

  • To follow or obey the custom, practice, or rules (especially of a religion). 

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