Silk is related to Type. Type is related to Form. Form is related to List. List is related to Invitation. 
Mouth is related to Vocal. Vocal is related to Sound. Sound is related to Ingredient. Ingredient is part of Mixture. 
Silk <--RelatedTo--> Type <--RelatedTo--> Form <--RelatedTo--> List <--RelatedTo--> Invitation 
Mouth <--RelatedTo--> Vocal <--RelatedTo--> Sound <--RelatedTo--> Ingredient --PartOf--> Mixture 