Creosote, Homasote.
Because both end with sote is why he thought they were alike. I thought this to be obvious when I saw the original post on this.
Speaking of Home Depot and Lowes, am I the only one who walks past the plywood (even if I don't need anything in the lumber dept) just because the smell reminds me of layout building? I guess like the smell of pine trees, even in the summer, reminds me of Christmas