一下子没想到太多，以下四组应该是属于同样性质吧：
1. machine – machinery
I’ve always been hopeless with machinery. 我对机械一直是一窍不通。
These machines are in the higher price bracket. 这些机器属于价钱比较高的一档。
2. poem – poetry
I used to write poetry when I was your age. 我像你这么大时常常写诗。
He prepared some poems to be recited at the English Evening. 他准备了几首将在英语晚会上朗诵的诗。
3. jewel – jewelry
Some of her jewellery was missing. 她的一些首饰丢失了。
She appeared at the reception wearing her finest jewels. 她出现在招待会戴着最漂亮的首饰。
4. scene – scenery
The scenery was beautiful beyond description.  风景美得无法描述。
Don’t let the children see such horrifying scenes. 不要让孩子们看到这样恐怖的景象。