Launch is a synonym of Execute. Execute is a synonym of Accomplish. Accomplish is related to Impossible. Impossible is related to Possible. 
Glad is the opposite of Unhappy. Unhappy is a synonym of Sad. Sad is a synonym of Uncomfortable. 
Launch <--Synonym--> Execute <--Synonym--> Accomplish <--RelatedTo--> Impossible <--RelatedTo--> Possible 
Glad <--Antonym--> Unhappy <--Synonym--> Sad <--Synonym--> Uncomfortable 