• fastropub,
• vastropub,
• bastropub,
• hastropub,
• yastropub,
• tastropub,
• gzstropub,
• gsstropub,
• gwstropub,
• gqstropub,
• gaatropub,
• gaztropub,
• gaxtropub,
• gadtropub,
• gaetropub,
• gawtropub,
• gasrropub,
• gasfropub,
• gasgropub,
• gasyropub

• astrology,
• gasoline,
• gasbag,
• gastrocnemius,
• gaspar,
• astronaut,
• gastritis,
• asthma,
• gastroscope,
• gastrointestinal,
• Gastroduodenal,
• Gaston,
• astrolabe,
• gastronomy,
• gasping.

The plural form of the word "gastropub" is "gastropubs".

The singular form of the word "gastropub" is "gastropub". The word remains the same in both singular and plural forms, unlike most nouns in English.