The site structure and KW

I apologize if the title is not in keeping with the theme but I had no other idea.

I have one question and I will probably get different answers and different opinions, but any advice is welcome. In preparation I have one site for one narrow topic, let's call a SHOVEL, I did some research and found KW that are useful.
Useful KW:
material shovel
wooden shovel
metal shovel
plastic shovel
color shovel
white shovel
blue shovel
red shovel

And what interesting me right now is what is better option? one post/page for one KW, or in one page about MATERIAL SHOVEL put 4 KW : material shovel, wooden shovel, metal shovel, plastic shovel?

EXAMPLE 1
-HOME -> w w w . mywebsite . c o m
-MATERIAL SHOVEL -> w w w . mywebsite . c o m /material_shovel KW: material shovel
-WOODEN SHOVEL -> w w w . mywebsite . c o m /wooden_shovel KW: wooden shovel
-METAL SHOVEL -> w w w . mywebsite . c o m /metal_shovel KW: metal shovel
-PLASTIC SHOVEL -> w w w . mywebsite . c o m /plastic_shovel KW: plastic shovel

Means in the first example each KW had a separate post/page, where for example KW MATERIAL SHOVEL wrote about all three materials more general, and then make a separate post/page detail analyzed each material.

EXAMPLE 2
-HOME -> w w w . mywebsite . c o m
-MATERIAL SHOVEL -> w w w . mywebsite . c o m /material_shovel KW: material shovel, wooden shovel, metal shovel, plastic shovel
-COLOR SHOVEL -> w w w . mywebsite . c o m /color_shovel KW: white shovel, blue shovel, red shovel

In another example, for all KW have one special post/page that would target the 4 kW in this case.

Which option is better, ie which option I'll be better placed in search engine?
Is better to have a separate page for each KW or on a page using multiple KW, and thus ease the BL right in this case I do not have a BL 4 different pages for different 4 KW but one page?