Army can be used for Protection. Army is related to Post. Timber is a type of Post. 
Grin is a synonym of Smile. Smile is related to Movement. Movement is related to Protest. 
Protection <--UsedFor-- Army <--RelatedTo--> Post <--IsA-- Timber 
Grin <--Synonym--> Smile <--RelatedTo--> Movement <--RelatedTo--> Protest 