How do I build a website around 2 synonymous keywords??

I want to build my first website or blog, but I'm having a problem:

Let's say my website is going to be about tables and desks.
Let's also say I used Market Samurai and found around 10 keywords for desks and 10 keywords for tables such as

best desks
best tables

desks for kids
tables for kids

desk online shop
table online shop

etc.

Now, my problem is that desk and table mean more or less the same thing. (I know they don't mean the same thing exactly, but let's say they do..I'm actually targeting other keywords of course! And the real keywords I target are true synonyms!).
How do I design my website if I want to use all the keywords above as my categories?

For example:

-desks for kids
-tables for kids
-living room desks
-living room tables

Now won't that look strange and unnatural to a visitor if everything I have on the site..categories..blog posts..article tags is there twice..once using the word table and once the word desk?

I don't know, but if I were a visitor I would think the website is probably trying to rank for both keywords..and even though the site will rank well for both keywords (desk and table)..to a human visitor it won't look very pleasing. We've all seen those cheap Adsense websites, with 10 different categories that mean the same damn thing!

Is there a way around this?
How do I design my website around two synonymous keywords?
And how do I write my articles..do I write one article for tables for kids and another article for desks for kids in order to really target and optimize for one keyword?

I don't want to build two websites..once for table and once for desk because I want to pour my time and love into one website..:p and I also read that Google favors authority sites.
Should I go for just one keyword even though the other one is just as profitable?

I'm clueless and don't know what to do..and I haven't even begun! lol