Ignore is the opposite of Notice. Notice is related to See. See is related to Window. Window is related to Building. 
Scientist does not want (to) Guess. Scientist is a type of Person. Person is related to Alive. 
Ignore <--Antonym--> Notice <--RelatedTo--> See <--RelatedTo--> Window <--RelatedTo--> Building 
Guess <--NotDesires-- Scientist --IsA--> Person <--RelatedTo--> Alive 