Filter abbreviations (FAQ, RSS, JAN, FEB, SEP...) from the wordlist

The dwyl 370k list contains acronyms and short-form abbreviations that
appear as 3-letter "words" and confuse learners (especially Tamil-medium
students). Curated blocklist drops months, weekdays, tech acronyms,
business titles, and country codes. Real words that look like
abbreviations (may, sun, sat, wed, mar) are kept intentionally.

src/game/Dictionary.js

@@ -15,6 +15,29 @@ const REAL_2L = new Set([
   'me','my','no','of','oh','ok','on','or','ox','so','to','up','us','we','ye',
 ]);
 
+// Abbreviations that leak in from the dwyl 370k wordlist and confuse learners,
+// especially Tamil-medium students. Real words that happen to look like
+// abbreviations (may, sun, sat, wed, mar) are intentionally kept.
+const ABBREV_BLOCK = new Set([
+  // months
+  'jan','feb','apr','jun','jul','aug','sep','sept','oct','nov','dec',
+  // weekdays
+  'mon','tue','tues','thu','thur','thurs','fri',
+  // tech / web
+  'faq','rss','url','uri','css','sql','php','ftp','dns','ssh','gui','api',
+  'sdk','ide','cpu','gpu','ram','rom','usb','dvd','cd','mp3','mp4','pdf',
+  'gif','jpg','jpeg','png','svg','xml','json','html','htm','http','https',
+  'tcp','udp','smtp','imap','wifi','vpn','lan','wan','iot','aws','gcp',
+  // org / business
+  'ceo','cfo','cto','coo','cmo','vip','llc','inc','ltd','plc','hq','hr','pr',
+  // country / region codes
+  'usa','uae','uk','eu','un','nato','asean',
+  // misc abbreviations
+  'etc','esp','vs','approx','dept','govt','dr','mr','mrs','ms','jr','sr',
+  'mph','kph','rpm','psi','gpa','iq','tv','dj','tba','tbd','asap','diy',
+  'lol','omg','btw','fyi','aka',
+]);
+
 export class WordDictionary {
   constructor(words = []) {
     this.set = new Set();
@@ -29,6 +52,7 @@ export class WordDictionary {
       if (!w || !/^[a-z]+$/.test(w) || this.set.has(w)) continue;
       if (w.length === 1 && !REAL_1L.has(w)) continue;
       if (w.length === 2 && !REAL_2L.has(w)) continue;
+      if (ABBREV_BLOCK.has(w)) continue;
       this.set.add(w);
       if (!this.byLen.has(w.length)) this.byLen.set(w.length, []);
       this.byLen.get(w.length).push(w);