I don’t have a favourite though it’s fun to say “hoffi coffi” and “gwych” brings back memories of writing lots of sgwrs in Welsh lessons at school at at one time my friend/cousin and I just kept writing “gwych” and it made us laugh. Kids right! 
I don’t like the word “archfarchnad” It doesn’t sound right to say. Sorry to be negative. I also like saying “Dw I wedi anghofio”
I don’t have a favourite English word and I’m still learning cymraeg so that’s my excuse 
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One I just discovered: Clats, for claggy mud stuck to your boots. I cant believe you’ve borrowed that from Geordieland, reit? 
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“hyfryd”
“cariad”
As always, I don’t really have favourites, but these are some words I like.
Pardon the vanity, but I quite like my own formal name in Welsh: Mihangel
And thanks to a kind Welsh friend, I recently learned:
haf bach (gŵyl) Mihangel : a period of summery weather usually occurring around Michaelmas, 29th September (lit. little summer of Michaelmas) .
(What we normally call in English an Indian Summer, which expression I gather comes from North America).
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Just learned ych-a-fi from the show “Keeping Faith”. It’s my favorite today
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I’d subscribe to Say Something in Geordie lol.
I use ”ynys” for myself because of the movie “the secret of roan inish” 
Not a clue that will work for everyone I’m sure.
That’s something all Welsh people say even those who don’t speak Welsh.
I just learnt llond llaw go iawn and that’s my favourite phrase so far.
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Without any fear of contradiction “sboncen” is the best word. It sounds very saucy for something so uncontroversial
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I don’t want to use it. Was asking people on a Facebook group for an alternative
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How about “anllythyrol”?
I listened to a podcast and that was the only word that was unsure of. I checked it out later and found that it meant uneducated or illiterate. I wish I hadn’t checked now
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Oh, as it’s Halloween, I’ll go for “Ysbryd Glan”
Flipping through grammar for something else & found a section that said “chdi” was a common form of ti in the North. It’s fun to say.
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From early on in SSIW I started developing favourite Welsh words. Diddorol was probably the first one. Now I’ve added neithiwr, cyfarfod, edrych. My overall favourite is probably rhywbeth.
Conversely there are some I don’t like, just because my English ears think they sound jarring or off-kilter in some way. Cyfle, cyflawni, fodlon. Bleh! 
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Sylweddoli, this is the word I like. 
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Now I fancy an ice cream
Has to be the onomatopoeic popty ping (microwave). So much nicer than the more staid meicrodon
annibyniaeth is mine. 
Yr Draig Goch - The Red Dragon (the most powerful expression in Welsh!)
Or Baner Cymru - the Flag of Wales.
These are the two most important (my favourite sentences) in Welsh.
I think “Hiraeth” would meet either of those in the semi final. Didn’t translate easily into Saesneg but it’s a lovely word
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