Peak is a synonym of Summit. Summit is related to Mountain. Mountain is related to Formation. 
Recognize is related to Acknowledge. Acknowledge is a synonym of Accept. Accept is the opposite of Deny. 
Peak <--Synonym--> Summit <--RelatedTo--> Mountain <--RelatedTo--> Formation 
Recognize <--RelatedTo--> Acknowledge <--Synonym--> Accept <--Antonym--> Deny 