Hot is similar to Warm. Warm is a synonym of Strong. Strong is related to Desire. Desire is related to Romantic. 
Celebrate is related to Birthday. Birthday is related to Special. 
Hot <--SimilarTo--> Warm <--Synonym--> Strong <--RelatedTo--> Desire <--RelatedTo--> Romantic 
Celebrate <--RelatedTo--> Birthday <--RelatedTo--> Special 