Here's my theory and take on it.
1. Starting year - starting year, so yeah
2. Adaptive Times - A year into the games release and just generally adapting and changing with things.
3. Building Blocks - Things are building up more, and FH is probably at it's peak. But things still need lots of work
4. A New Beginning - From what I can gather, this was when the planning of the later 2016 update came to fruition. At this point KovuLKD had stopped correspondence with the staff at the time, and so they wanted to move forward.
5. Clockworks - Working out things from within, preparing for the update to come.
6. Fortify - To Fortify, is to strengthen. This was an important year to lift up the community and to make it stronger, the update came and it lead to mixed results, but still giving some strength into the community to take the steps forward was important
7. Sacrifice - I'm not too sure about this one, but I figured that somethings needed to be given up for the greater good. I don't know what those things are, but sacrifice
8. Putrification - This is where things get all bacteria-fungus esque. But from what I found, it's a term for decomposition of organic matter that then creates a foul smell.Which considering the events that year..
9. Fungus - I honestly don't know. Maybe a fungus expert can step in, because I feel it does tie into Putrification somehow and I'm not smart enough to tell.
10. Apocalypse - Who knows honestly. Could be the struggling playerbase, making FH barren and empty.