Set a minimum word count for inputs to a Single Text Field in WPForms.

wpf-set-minimum-word-count.php

<?php

add_action( 'wpforms_process_validate_text', function( $field_id, $field_submit, $form_data ) {
 
    // Optional, you can limit to specific forms. Below, we restrict output to
    // form ID #2056 and  field ID #5
    if ( absint( $form_data['id'] ) !== 2056 && $field_id !== 5 ) {
        return;
    }
    
    $min_word_count = 10;
	
    if( str_word_count( $field_submit ) < $min_word_count ) {
        wpforms()->process->errors[ $form_data['id'] ][ $field_id ] = esc_html__( 'Please enter at least ' .$min_word_count .' words.' , 'wpforms' );
	return;		
    }

}, 10, 3 );