(Ia) Determine the longest common word/words with precisely four consonants in a row.
(Ib) Determine the shortest common word/words with precisely four consonants in a row.

(II) Extend (I) to cover the case of archaic/esoteric words.

*** No slangs, abbreviations/acronyms/proper names. Also, NO hyphenated words like X-ray, A-Bomb.