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The correct answer is the vocabulary spurt. 

Around age two, children often demonstrate a sudden and significant growth in their vocabulary. During this age, children learn and use new words quite rapidly- approximately 80 words per month. This accelerated rate of developing vocabulary steadily rises between age two and seven. This rapid acquisition and use of new vocabulary is called the vocabulary spurt.   

Vocabulary spurt

Vocabulary spurt is vital part of development which occurs during the child’s second year of life. point in During this time,  a child may display an abrupt growth in their verbal vocabulary. This occurs when a child switches from early language learning of approximately two words per week per week to unexpectedly using up to 20 words