314907
John " Jack " Warner ( 1883 – 16 May 1948 ) was an English professional footballer who played as a full-back in the years prior to World War I , spending most of his career with Portsmouth in the Southern League .
 Jack, Warner, Portsmouth, Southern League
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jack, Warner, Portsmouth, Southern League