What is the meaning of Beta_particle?

5-letter words containing

• 5-letter words containing l

• 5-letter words containing e

• 5-letter words containing e

• 5-letter words containing m

• 5-letter words containing u

5-letter words starting with

• 5-letter words starting with i

• 5-letter words starting with r

• 5-letter words starting with u

• 5-letter words starting with l

• 5-letter words starting with s

5-letter words in the middle

• 5-letter words in the middle n

• 5-letter words in the middle n

• 5-letter words in the middle b

• 5-letter words in the middle b

• 5-letter words in the middle u

5-letter words ending with

• 5-letter words ending with f

• 5-letter words ending with k

• 5-letter words ending with i

• 5-letter words ending with u

• 5-letter words ending with t

5-letter words excluding

• 5-letter words excluding i

• 5-letter words excluding e

• 5-letter words excluding k

• 5-letter words excluding i

• 5-letter words excluding s