101 people's suggestions for 'my favourite word':
lugubrious / crepuscular / pickle / requiem / quagmire / anyway / flan / snooze / corduroy / heather / cookie / serene / monkey / tetchy / gnarly / plinth / imperial / frump / pilchard / diphthong / simulacrum / paradox / mollusc / ambivalence / aardvark / petard / scabies / doily / transmogrify / calamity / onomatopoeia / threnody / swank / elephant / mint / opsimath / sphincter / molybdenum / whelk / serendipity / giblet / rainbow / cerulean / malarkey / turquoise / loquacious / precarious / roadkill / juxtaposition / fuselage / lentil / bordello / smock / gargantuan / inamorata / rhubarb / lasso / purple / swizzlestick / zeitgeist / epitome / harmony / curmudgeonly / phlegm / jive / contrast / plectrum / segue / macabre / moth / vibe / synchronicity / plethora / loophole / acquiesce / catalyst / oxymoron / arcane / beeves / shampoo / delirium / assimilate / nibble / squiggle / reverie / prissy / mew / liaison / moist / syzygy / glimpse / sassy / melodic / ubiquitous / malarkey / cloaca / shenanigans / cognac / ointment / wench
I like 'aquifer' and 'watershed'.
'Palimpsest', that's a good one that's nothing to do with water.