Dig is related to Plant. Plant is related to Energy. Energy is related to Go. Go is the opposite of Freeze. 
Suitable is a synonym of Happy. Happy is a synonym of Bright. Bright is related to Color. Color is related to Visible. 
Dig <--RelatedTo--> Plant <--RelatedTo--> Energy <--RelatedTo--> Go <--Antonym--> Freeze 
Suitable <--Synonym--> Happy <--Synonym--> Bright <--RelatedTo--> Color <--RelatedTo--> Visible 