Recruit is related to Hire. Hire is a synonym of Engagement. 
Leap is related to Year. Year is related to Summer. Summer is related to Period. Period is the opposite of Frequency. 
Recruit <--RelatedTo--> Hire <--Synonym--> Engagement 
Leap <--RelatedTo--> Year <--RelatedTo--> Summer <--RelatedTo--> Period <--Antonym--> Frequency 