Senate is a different concept from Congress. Congress is related to Representative. Representative is related to Republic. 
you are likely to find Bench in/at/on Garden. Garden is related to Outside. you are likely to find Animal in/at/on Outside. Animal can be used for Race. 
Senate <--DistinctFrom--> Congress <--RelatedTo--> Representative <--RelatedTo--> Republic 
Bench --AtLocation--> Garden <--RelatedTo--> Outside <--AtLocation-- Animal --UsedFor--> Race 