I can't do better than this quote-
'Once upon a time, words began to vanish from the language of children. They disappeared so quietly that at first, almost no one noticed -fading away like water on stone. The words were those that children used to name the natural world around them: acorn, adder, bluebell, bramble, conker - gone! Fern, heather, kingfisher, otter, raven, willow, wren ... all of them gone! The words were becoming lost: no longer vivid in children's voices, no longer alive in their stories.
You hold in your hands a spellbook for conjuring back these lost words. To read it you will need to seek, find and speak. It deals with things that are missing and things that are hidden, in absences and in appearances. It is told in gold - the gold of the goldfinches that flit through its pages in charms - and it holds not poems but spells of many kinds that might just, by the old, strong magic of being spoken aloud, untold dreams and songs, and summon lost words back into the mouth and the mind's eye.'
I went ahead and ordered this book from Britain and I hope it always holds a place on our shelves.
The Lost Words by Robert Macfarlane and Jackie Morris
October 2, 2018, or now at The Book Depository